add more components to contact model

src/main/java/de/ul/swtp/modules/contactmanagement/Contact.java

@@ -26,13 +26,10 @@ import java.util.List;
         resolver = ContactIdResolver.class)
 public class Contact implements Serializable {
 
-    //@Null may well not work here, if the validations are call on update as well as create
-    //@Null
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
 
-    // perhaps we need a @NotBlank here? Are emails obligatory?
     @Email(regexp = "^.*@.*\\..*")
     private String email;
 
@@ -51,7 +48,6 @@ public class Contact implements Serializable {
     @Digits(integer = 16, fraction = 0)
     private String phone;
 
-    //@NotBlank
     @OneToOne
     private Address address;
 

src/main/java/de/ul/swtp/modules/contactmanagement/contactdetails/Address.java

@@ -3,11 +3,12 @@ package de.ul.swtp.modules.contactmanagement.contactdetails;
 import lombok.Data;
 
 import javax.persistence.*;
+import java.io.Serializable;
 
 @Entity
 @Table(name = "cm_address")
 @Data
-public class Address {
+public class Address implements Serializable {
 
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)

src/main/java/de/ul/swtp/modules/contactmanagement/contactdetails/BankAccount.java

@@ -3,11 +3,12 @@ package de.ul.swtp.modules.contactmanagement.contactdetails;
 import lombok.Data;
 
 import javax.persistence.*;
+import java.io.Serializable;
 
 @Entity
 @Table(name = "cm_bankdetails")
 @Data
-public class BankAccount {
+public class BankAccount implements Serializable {
 
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)

src/main/java/de/ul/swtp/modules/contactmanagement/contactdetails/VoluntaryDetails.java

@@ -3,11 +3,12 @@ package de.ul.swtp.modules.contactmanagement.contactdetails;
 import lombok.Data;
 
 import javax.persistence.*;
+import java.io.Serializable;
 
 @Entity
 @Table(name = "cm_voluntarydetails")
 @Data
-public class VoluntaryDetails {
+public class VoluntaryDetails implements Serializable {
 
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)